US20050017417A1 - Material submergence system - Google Patents
Material submergence system Download PDFInfo
- Publication number
- US20050017417A1 US20050017417A1 US10/881,738 US88173804A US2005017417A1 US 20050017417 A1 US20050017417 A1 US 20050017417A1 US 88173804 A US88173804 A US 88173804A US 2005017417 A1 US2005017417 A1 US 2005017417A1
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- US
- United States
- Prior art keywords
- molten metal
- base
- tube
- gas
- outlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B21/00—Obtaining aluminium
- C22B21/06—Obtaining aluminium refining
- C22B21/064—Obtaining aluminium refining using inert or reactive gases
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
- C22B9/055—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ while the metal is circulating, e.g. combined with filtration
Definitions
- a bath of molten aluminum When demagging or degassing aluminum, chlorine or nitrogen gas, respectively, is released into a quantity of molten aluminum, this quantity generally being referred to as a bath of molten aluminum.
- the bath is usually contained within the walls of a reverbatory furnace.
- chlorine gas When demagging aluminum, chlorine gas is released into the bath and the chlorine bonds, or reacts, with the magnesium wherein each pound of magnesium reacts with approximately 2.95 pounds of chlorine to form magnesium chloride, a generally insoluble material which can be skimmed from the surface of the bath.
- Several methods for introducing chlorine into a molten aluminum bath are known.
- a gas injection tube has been used to introduce gas into a molten metal stream where molten metal is pumped from one chamber to another.
- the gas injection tube is inserted into a hole in the pump base of the molten metal pump either upstream of, downstream of or in the pump chamber.
- Gas, such as chlorine, is injected into the molten metal stream where it can react with the molten metal.
- the pump base of the molten metal pump is one of the more expensive pieces of the pump assembly. Since the gas injection tube is inserted into a hole in the base, it is difficult to retrofit a metal pump that does not include a gas inlet. Also, the more holes that are drilled into the base, the greater the likelihood that the base can wear out more quickly. Accordingly, it is desirable to provide a gas injection tube having a tube base that can be positioned near the outlet of the pump base of the molten metal pump.
- a gas injection tube includes a first end adapted to connect to a reactive gas source and a second end.
- a tube base attaches to the second end of the gas injection tube.
- the gas injection tube includes a passageway and the tube base includes a channel. The passageway communicates with the channel to provide gas to a molten metal stream traveling through the channel.
- the gas injection tube can be used with a variety of molten metal pumps.
- the tube base is situated near the outlet of a conventional molten metal pump base such that the channel of the tube base is aligned with the outlet of the pump base.
- the tube base is situated near the outlet of a molten metal pump base that includes a nozzle positioned adjacent the outlet. The channel of the tube base is aligned with the outlet, with the molten metal stream passes through the nozzle prior to entering the channel.
- the tube base is situated near the outlet of a scrap submergence device, such as types shown in U.S. Pat. No. 6,217,823.
- FIG. 1 is a side elevation view, partially in cross section, of a molten metal pump and a gas injection device according to the present invention.
- FIG. 2 is an end elevation view of the gas injection device of FIG. 1 .
- FIG. 3 is a side elevation view, partially in cross section, of a molten metal pump according to an alternative embodiment of the present invention.
- FIG. 4 is a cross-sectional view of a pump well and a charge well of a molten metal scrap submergence device.
- FIG. 5 is a top plan view of the charge well of FIG. 4 .
- a conventional molten metal pump 10 includes a hanger assembly 12 used for lifting and positioning of the pump as necessary within a furnace (not shown).
- a motor 14 is supported by a motor mount 16 , itself supported by a support plate 18 .
- the motor 14 is connected via a coupling assembly 22 to a rotatable shaft 24 secured to an impeller 26 .
- a pump base 28 rests on the floor of a refractory furnace and forms a foundation for the support plate 18 and motor mount 16 by a plurality of posts 32 .
- the impeller 26 is rotatable within a pumping chamber 34 and its rotation draws molten metal (not shown) into the pumping chamber 34 through an inlet 36 and discharges the molten metal through an outlet passage 38 toward an outlet 40 .
- a gas injection tube 42 can be positioned in the furnace near the molten metal pump 10 .
- the gas injection tube can be made of a refractory material, such as a ceramic material that would not quickly corrode in a molten metal environment.
- the tube 42 is hollow and includes a passageway 44 .
- a first end 46 of the tube includes an opening 48 that communicates with the passageway 44 .
- the first end 46 of the tube is adapted to attach to a reactive gas source (not shown).
- a second end 50 of the tube also includes an opening 52 that communicates with the passageway 44 .
- the second end 50 of the tube attaches to a tube base 54 and protrudes through an opening 56 in the tube base.
- the tube base can also be made of a refractory material.
- the tube base 54 is situated near the outlet 40 of the pump base 28 , obviating the need to provide an extra hole in the pump base. As seen in FIGS. 1 and 2 , the tube base 54 can have a substantially elongated horseshoe shape.
- the tube base 54 defines a channel 58 through which the molten metal that is leaving the outlet 40 (shown in phantom) must pass.
- the opening 52 of the gas injection tube communicates with the channel 58 . Accordingly, the benefits of introducing a reactive gas downstream of a pump chamber can be achieved, however the gas injection tube need not be inserted into a hole in the molten metal pump base.
- the shape of the tube base 54 complements the shape of the outlet 40 .
- the second end 50 of the tube 42 can terminate near the upper edge of the outlet 40 and the curve of the channel 58 can follow the contour of the outlet 40 .
- the second end 50 of the tube 42 can also terminate below the upper edge of the outlet 40 so that the gas is injected more towards the bottom of the molten metal stream.
- tube base 54 is shown as a horseshoe configuration having an open bottom, other configurations, including configurations that include a bottom, are contemplated.
- the base 54 can be rectangular, elliptical and other shapes also.
- the gas injection tube 42 is shown as being vertical, however it can also be situated at an angle other than normal.
- FIG. 3 depicts an alternative molten metal pump with which the gas injection tube 42 can be used.
- a molten metal pump 10 ′ includes a hanger assembly 12 ′, a motor 14 ′ supported by a motor mount 16 ′, and a support plate 18 ′.
- the motor 14 ′ is connected via a coupling assembly 22 ′ to a rotatable shaft 24 ′ secured to an impeller 26 ′.
- a pump base 28 ′ rests on the floor of a refractory furnace (not shown) and forms a foundation for the support plate 18 ′ and motor mount 16 ′ by a plurality of posts 32 ′.
- the impeller 26 ′ is rotatable within a pumping chamber 34 ′ and its rotation draws molten metal (not shown) into the pumping chamber 34 ′ through an inlet 36 ′ and discharges the molten metal through an outlet passage 38 ′ toward an outlet 40 ′.
- Adjacent the outlet 40 ′ is a convergent nozzle 62 .
- the convergent nozzle 62 is more particularly described in U.S. Pat. No. 5,993,728, which is incorporated by reference.
- the tube base 54 of the gas injection tube 42 can be placed adjacent the outlet 40 ′ of the outlet passage 38 ′, thus obviating the need to drill a hole in the base 28 ′ into which the gas injection tube can be inserted. Any of the embodiments of the gas injection tube 42 described above can be used with the pump 10 ′.
- the tube base 54 of the tube 42 can be positioned adjacent the outlet 40 ′ similar to that shown in FIGS. 1 and 2 .
- a pump 120 is positioned in a pump well 114 and draws molten aluminum from a hearth (not shown) forcing it into the charge well 116 .
- rotation of an impeller 122 draws molten aluminum from a bath 124 , into the pump 116 and forces it through an outlet 126 , up a passage 128 , and through an inlet 130 into the charge well 116 .
- the ramp 132 can be sloped over a first 180 degree portion 140 , and be horizontal over the final about 120 degree portion 142 .
- Metal chips being recycled are deposited onto the surface of the melt 148 in charge well 116 .
- the tube base 54 of the tube 42 can be positioned adjacent the outlet 150 similar to that shown in FIGS. 1 and 2 .
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
- The present invention claims priority from U.S. provisional application Ser. No. 60/483,732 filed Jun. 30, 2003.
- In the purification of molten metals, particularly aluminum, it is frequently desired to remove dissolved gases such as hydrogen or dissolved metals, chiefly magnesium. The removal of dissolved gas is known as “degassing”, while the removal of magnesium is known as “demagging”.
- When demagging or degassing aluminum, chlorine or nitrogen gas, respectively, is released into a quantity of molten aluminum, this quantity generally being referred to as a bath of molten aluminum. The bath is usually contained within the walls of a reverbatory furnace. When demagging aluminum, chlorine gas is released into the bath and the chlorine bonds, or reacts, with the magnesium wherein each pound of magnesium reacts with approximately 2.95 pounds of chlorine to form magnesium chloride, a generally insoluble material which can be skimmed from the surface of the bath. Several methods for introducing chlorine into a molten aluminum bath are known.
- A gas injection tube has been used to introduce gas into a molten metal stream where molten metal is pumped from one chamber to another. The gas injection tube is inserted into a hole in the pump base of the molten metal pump either upstream of, downstream of or in the pump chamber. Gas, such as chlorine, is injected into the molten metal stream where it can react with the molten metal.
- The pump base of the molten metal pump is one of the more expensive pieces of the pump assembly. Since the gas injection tube is inserted into a hole in the base, it is difficult to retrofit a metal pump that does not include a gas inlet. Also, the more holes that are drilled into the base, the greater the likelihood that the base can wear out more quickly. Accordingly, it is desirable to provide a gas injection tube having a tube base that can be positioned near the outlet of the pump base of the molten metal pump.
- According to a first aspect of the invention, a gas injection tube includes a first end adapted to connect to a reactive gas source and a second end. A tube base attaches to the second end of the gas injection tube. The gas injection tube includes a passageway and the tube base includes a channel. The passageway communicates with the channel to provide gas to a molten metal stream traveling through the channel.
- The gas injection tube can be used with a variety of molten metal pumps. In one embodiment, the tube base is situated near the outlet of a conventional molten metal pump base such that the channel of the tube base is aligned with the outlet of the pump base. In another embodiment, the tube base is situated near the outlet of a molten metal pump base that includes a nozzle positioned adjacent the outlet. The channel of the tube base is aligned with the outlet, with the molten metal stream passes through the nozzle prior to entering the channel. In yet another embodiment, the tube base is situated near the outlet of a scrap submergence device, such as types shown in U.S. Pat. No. 6,217,823.
-
FIG. 1 is a side elevation view, partially in cross section, of a molten metal pump and a gas injection device according to the present invention. -
FIG. 2 is an end elevation view of the gas injection device ofFIG. 1 . -
FIG. 3 is a side elevation view, partially in cross section, of a molten metal pump according to an alternative embodiment of the present invention. -
FIG. 4 is a cross-sectional view of a pump well and a charge well of a molten metal scrap submergence device. -
FIG. 5 is a top plan view of the charge well ofFIG. 4 . - While the invention will be described in connection with the preferred embodiments, it is to be understood that it is not intended to limit the invention to those embodiments. On the contrary, it is intended to cover all alternatives, modifications and equivalents as may be included within the spirit and scope of the invention defined by the appended claims.
- Referring to
FIG. 1 , a conventionalmolten metal pump 10 includes ahanger assembly 12 used for lifting and positioning of the pump as necessary within a furnace (not shown). Amotor 14 is supported by amotor mount 16, itself supported by asupport plate 18. Themotor 14 is connected via acoupling assembly 22 to arotatable shaft 24 secured to animpeller 26. - A
pump base 28 rests on the floor of a refractory furnace and forms a foundation for thesupport plate 18 andmotor mount 16 by a plurality ofposts 32. Theimpeller 26 is rotatable within apumping chamber 34 and its rotation draws molten metal (not shown) into thepumping chamber 34 through aninlet 36 and discharges the molten metal through anoutlet passage 38 toward anoutlet 40. - A
gas injection tube 42 can be positioned in the furnace near themolten metal pump 10. The gas injection tube can be made of a refractory material, such as a ceramic material that would not quickly corrode in a molten metal environment. Thetube 42 is hollow and includes apassageway 44. Afirst end 46 of the tube includes an opening 48 that communicates with thepassageway 44. Thefirst end 46 of the tube is adapted to attach to a reactive gas source (not shown). Asecond end 50 of the tube also includes an opening 52 that communicates with thepassageway 44. Thesecond end 50 of the tube attaches to atube base 54 and protrudes through an opening 56 in the tube base. - The tube base can also be made of a refractory material. The
tube base 54 is situated near theoutlet 40 of thepump base 28, obviating the need to provide an extra hole in the pump base. As seen inFIGS. 1 and 2 , thetube base 54 can have a substantially elongated horseshoe shape. Thetube base 54 defines achannel 58 through which the molten metal that is leaving the outlet 40 (shown in phantom) must pass. The opening 52 of the gas injection tube communicates with thechannel 58. Accordingly, the benefits of introducing a reactive gas downstream of a pump chamber can be achieved, however the gas injection tube need not be inserted into a hole in the molten metal pump base. - With further reference to
FIG. 2 , the shape of thetube base 54 complements the shape of theoutlet 40. Thesecond end 50 of thetube 42 can terminate near the upper edge of theoutlet 40 and the curve of thechannel 58 can follow the contour of theoutlet 40. Thesecond end 50 of thetube 42 can also terminate below the upper edge of theoutlet 40 so that the gas is injected more towards the bottom of the molten metal stream. - Even though the
tube base 54 is shown as a horseshoe configuration having an open bottom, other configurations, including configurations that include a bottom, are contemplated. For example, thebase 54 can be rectangular, elliptical and other shapes also. Furthermore, thegas injection tube 42 is shown as being vertical, however it can also be situated at an angle other than normal. -
FIG. 3 depicts an alternative molten metal pump with which thegas injection tube 42 can be used. In this figure, like numerals having a primed suffix correspond to like components and new numerals correspond to new components. Amolten metal pump 10′ includes ahanger assembly 12′, amotor 14′ supported by amotor mount 16′, and asupport plate 18′. Themotor 14′ is connected via acoupling assembly 22′ to arotatable shaft 24′ secured to animpeller 26′. Apump base 28′ rests on the floor of a refractory furnace (not shown) and forms a foundation for thesupport plate 18′ and motor mount 16′ by a plurality ofposts 32′. Theimpeller 26′ is rotatable within a pumpingchamber 34′ and its rotation draws molten metal (not shown) into the pumpingchamber 34′ through aninlet 36′ and discharges the molten metal through anoutlet passage 38′ toward anoutlet 40′. Adjacent theoutlet 40′ is aconvergent nozzle 62. Theconvergent nozzle 62 is more particularly described in U.S. Pat. No. 5,993,728, which is incorporated by reference. - The
tube base 54 of thegas injection tube 42 can be placed adjacent theoutlet 40′ of theoutlet passage 38′, thus obviating the need to drill a hole in the base 28′ into which the gas injection tube can be inserted. Any of the embodiments of thegas injection tube 42 described above can be used with thepump 10′. Thetube base 54 of thetube 42 can be positioned adjacent theoutlet 40′ similar to that shown inFIGS. 1 and 2 . - Referring now to
FIG. 4 , a scrap submergence system is described, similar to U.S. Pat. No. 6,217,823, which is incorporated by reference, and thegas injection tube 42 can be used in this environment also. Apump 120 is positioned in a pump well 114 and draws molten aluminum from a hearth (not shown) forcing it into the charge well 116. Referring also toFIG. 5 , rotation of animpeller 122 draws molten aluminum from abath 124, into thepump 116 and forces it through anoutlet 126, up apassage 128, and through aninlet 130 into the charge well 116. Molten aluminum flows up aramp 132 within the charge well 116, spilling over aninner edge 134 into acavity 136 and exiting through anopening 138 towards anoutlet 150. It is preferred that aleading edge 144 of theramp 132 be positioned adjacent theinlet 130 to the charge well 116. Theramp 132 can be sloped over a first 180degree portion 140, and be horizontal over the final about 120degree portion 142. Metal chips being recycled are deposited onto the surface of themelt 148 in charge well 116. Thetube base 54 of thetube 42 can be positioned adjacent theoutlet 150 similar to that shown inFIGS. 1 and 2 . - The invention has been described in a number of different environments. The gas injection tube and tube base can be used with molten metal pumps and systems described in U.S. Pat. Nos. 5,993,728 and 6,217,823 as well as other conventional molten metal pump systems. While the invention has been described in conjunction with specific embodiments thereof, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications and variations as fall within the spirit and broad scope of the appended claims.
Claims (3)
Priority Applications (1)
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US10/881,738 US7455809B2 (en) | 2003-06-30 | 2004-06-30 | Material submergence system |
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US48373203P | 2003-06-30 | 2003-06-30 | |
US10/881,738 US7455809B2 (en) | 2003-06-30 | 2004-06-30 | Material submergence system |
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US20050017417A1 true US20050017417A1 (en) | 2005-01-27 |
US7455809B2 US7455809B2 (en) | 2008-11-25 |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100050815A1 (en) * | 2006-07-04 | 2010-03-04 | Heggset Teknologi As | Method and device for admixture of powder in a liquid |
WO2013158607A1 (en) * | 2012-04-16 | 2013-10-24 | Pyrotek, Inc. | Molten metal scrap submergence apparatus |
WO2015057660A1 (en) * | 2013-10-15 | 2015-04-23 | Pyrotek, Inc. | Impact resistant scrap submergence device |
EP3504499A4 (en) * | 2016-08-29 | 2020-04-01 | Pyrotek, Inc. | Scrap submergence device |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1944733A (en) * | 1932-10-22 | 1934-01-23 | Aluminum Co Of America | Siphoning metal |
US4169584A (en) * | 1977-07-18 | 1979-10-02 | The Carborundum Company | Gas injection apparatus |
US5650120A (en) * | 1995-06-12 | 1997-07-22 | Alphatech, Inc. | Bubble-operated recirculating pump for metal bath |
US5662725A (en) * | 1995-05-12 | 1997-09-02 | Cooper; Paul V. | System and device for removing impurities from molten metal |
US5993728A (en) * | 1996-07-26 | 1999-11-30 | Metaullics Systems Co., L.P. | Gas injection pump |
US6217823B1 (en) * | 1998-03-30 | 2001-04-17 | Metaullics Systems Co., L.P. | Metal scrap submergence system |
-
2004
- 2004-06-30 US US10/881,738 patent/US7455809B2/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1944733A (en) * | 1932-10-22 | 1934-01-23 | Aluminum Co Of America | Siphoning metal |
US4169584A (en) * | 1977-07-18 | 1979-10-02 | The Carborundum Company | Gas injection apparatus |
US5662725A (en) * | 1995-05-12 | 1997-09-02 | Cooper; Paul V. | System and device for removing impurities from molten metal |
US5650120A (en) * | 1995-06-12 | 1997-07-22 | Alphatech, Inc. | Bubble-operated recirculating pump for metal bath |
US5993728A (en) * | 1996-07-26 | 1999-11-30 | Metaullics Systems Co., L.P. | Gas injection pump |
US6217823B1 (en) * | 1998-03-30 | 2001-04-17 | Metaullics Systems Co., L.P. | Metal scrap submergence system |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100050815A1 (en) * | 2006-07-04 | 2010-03-04 | Heggset Teknologi As | Method and device for admixture of powder in a liquid |
WO2013158607A1 (en) * | 2012-04-16 | 2013-10-24 | Pyrotek, Inc. | Molten metal scrap submergence apparatus |
CN104246405A (en) * | 2012-04-16 | 2014-12-24 | 派瑞泰克有限公司 | Molten metal scrap submergence apparatus |
CN104246405B (en) * | 2012-04-16 | 2016-12-07 | 派瑞泰克有限公司 | Motlten metal waste material submergence equipment |
US9920992B2 (en) | 2012-04-16 | 2018-03-20 | Pyrotek, Inc. | Molten metal scrap submergence apparatus |
WO2015057660A1 (en) * | 2013-10-15 | 2015-04-23 | Pyrotek, Inc. | Impact resistant scrap submergence device |
US9481918B2 (en) | 2013-10-15 | 2016-11-01 | Pyrotek, Inc. | Impact resistant scrap submergence device |
EP3504499A4 (en) * | 2016-08-29 | 2020-04-01 | Pyrotek, Inc. | Scrap submergence device |
US11619448B2 (en) | 2016-08-29 | 2023-04-04 | Pyrotek, Inc. | Scrap submergence device |
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